Apparently from Howell’s ‘Collection of Proverbs’ from 1659, but quoted in ‘English Proverbs and Proverbial Phrases’ by W C Hazlitt (1907):
Sutton Wall and Kenchester Hill
Are able to buy London, were it to sell.These are two places fruitful in the country, saith Mr. Howell.
Maybe it’s a misquote and should imply the two places were better than London in the past? as they both have big forts (Kenchester is next to Credenhill Park Wood fort) – rather like the rhymes that tell ‘when [local old place] was a bustling town,
[local big city] was a furzy down’. Maybe, maybe not.
That's intriguing, if completely obscure. Sutton Walls was also reputed to have been next to one of Offa's palaces, but that seems a little "mists of time" for a 17th century proverb to be referencing.
Or, on a bit of random speculation, I wonder if it implies that there is Treasure buried there or something. That wouldn't be unheard of at other forts (er cadbury, dolebury, off the top of my head)?
Any would-be treasure seekers should beware the toxic waste then!
Hmm that is disappointing isn't it.